21274700 has 36 divisors (see below), whose sum is σ = 46767840. Its totient is φ = 8399040.

The previous prime is 21274697. The next prime is 21274709. The reversal of 21274700 is 747212.

It is a super-2 number, since 2×21274700² = 905225720180000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21274709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6554 + ... + 9246.

Almost surely, 2^21274700 is an apocalyptic number.

21274700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21274700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23383920).

21274700 is an abundant number, since it is smaller than the sum of its proper divisors (25493140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21274700 is a wasteful number, since it uses less digits than its factorization.

21274700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786 (or 2779 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21274700 is about 4612.4505417403. The cubic root of 21274700 is about 277.0901885855.

The spelling of 21274700 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred".